Scientific Reports 6: Article number: 20780; published online: 09 February 2016; updated: 20 July 2016

The Acknowledgements section in this Article is incomplete.

“We are grateful to Prof. Alberto Alain Gabbai and Dr. Wladimir B. V. R. Pinto for valuable suggestions on the manuscript. This study was supported by research grants 2007/03145-9 (CHT), 2007/00808-7 (GSR), São Paulo Research Foundation (FAPESP) and Coordenação de Aperfeiçoamento de Pessoal de Ensino Superior (CAPES) to GSR and JG.”

should read:

“We are grateful to Prof. Alberto Alain Gabbai and Dr. Wladimir B. V. R. Pinto for valuable suggestions on the manuscript. This study was supported by research grants 2007/03145-9 (CHT), 2007/00808-7 (GSR), 2016/03920-1 (CHT), São Paulo Research Foundation (FAPESP) and Coordenação de Aperfeiçoamento de Pessoal de Ensino Superior (CAPES) to GSR and JG”.